I don't think you will get better performance out of the 18-105, but you will get a bit more on the long end. This may serve you a little better as a walk around lens.
While these are not pro lens, in the hands of a skilled photographer one can get excellent results. I have had several of my photographs published in magazines, calendars and TV, using the 18-135 kit lens.
Select one and enjoy it. Good luck in a great hobby!
Jerry Jaynes Great Smoky Mountains of North Carolina